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| | Traction - LoveToKnow 1911 |
 | | When men and animals carry burdens, or draw or propel loads in certain vehicles, it is difficult, and sometimes impossible, to determine the duty performed in foot-pounds of work, because of the uncertainty of the amount in pounds of the resistance overcome. |
 | | Before the advent of electric traction, the tramways using cable propulsion were numerous and of great size, as at San Francisco, Chicago, Washington, Baltimore, Philadelphia and New York in America, at Highgate Hill (London) and Edinburgh in the United Kingdom, and at Melbourne in Australia. |
 | | Electric traction, as treated here, will refer to the operation of vehicles for the transportation of passengers and goods upon tracks, as distinguished from what are known as telpherage systems on the one hand (see Conveyors), and automobiles intended to run on common roads on the other (see Motor Vehicles). |
| www.1911encyclopedia.org /Traction (10024 words) |
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